package main

import "fmt"
/*
 * The defer function.
 */

func demo() {
	// Keep count and total of entered numbers.
	tot := 0
	count := 0

	// Cleanup to give the final stats.
	finisher := func() {
		fmt.Printf("=== You entered %d numbers, average %g ===\n",
			count, float32(tot)/float32(count))
	}
	defer finisher()

	// Words for input numbers.
	words := [20]string {
		"zip", "wumpus", "goobers", "thump", "ding!",
		"teeth", "snorkel", "airplane", "warble", "snack",
		"northern", "morph", "angle", "tongs", "conduit",
		"island", "sunrise", "orbit", "dice", "meatball" }

	// Read numbers and print them, with their words.
	for {
		// Read a number.
		var val int
		fmt.Print("Pls enter a number: ")
		rdct, _ := fmt.Scan(&val)
		if rdct == 0 {
			break
		}

		// Print the number and its word.
		fmt.Printf("You entered %d: %s\n", val, words[val])

		// Count and total.
		count++
		tot += val
	}
}

func main() {
	// This function runs essentially after main finishes.  The
	// systax here both creates a function and calls it, never giving
	// it a name.
	defer func() { fmt.Println("And now we are past done.") } ()
	
	demo()
	fmt.Println("Now the main program is done")
}